It is time to remind people to slow down when driving through the city’s neighborhoods. This is the spirit of the campaign that starts on Mon. May 14, promoting public awareness aimed at curbing speeding on Boston Streets. This is OK, but calling for an increase in the fines to punish drivers won’t work. Nor will calling for more signs on the streets or installing radar. A question for Councilor John Tobin: If drivers don’t read “STOP,” how can they read “Please Slow Down Boston” on a red and white sign?